Image sensor, focusing control method, and electronic device

An image sensor, comprising:

• a photosensitive cell array, comprising one or more focusing photosensitive cells and a plurality of non-focusing photosensitive cells;
• each of the focusing photosensitive cells comprising a plurality of photosensitive pixels;
• a filtering cell array, disposed above the photosensitive cell array;
• a micro-lens array, located above the filtering cell array, and comprising one or more first micro-lenses and a plurality of second micro-lenses;
• wherein each of the focusing photosensitive cells is covered by a corresponding one of the first micro-lenses, and each of the non-focusing photosensitive cells is covered by N*N of the second micro-lenses;
• wherein N is a positive integer;
• and
• a controller, coupled to the photosensitive cell array and configured to:
• control the photosensitive cell array to enter a focusing mode;
• read output values of a part of the photosensitive pixels in each of the focusing photosensitive cells as first output values;
• read output values of the remaining part of the photosensitive pixels in each of the focusing photosensitive cells as second output values;
• and
• perform focusing control according to the first output values and the second output values;
• wherein the micro-lens array has a horizontal centerline, a vertical centerline, and four edges, the number of the first micro-lenses is two or more, and the two or more first micro-lenses comprises:
• a first group of first micro-lenses, disposed along the horizontal centerline;
• a second group of first micro-lenses, disposed along the vertical centerline;
• and
• a third group of first micro-lenses, disposed on the four edges;
• wherein the first group of first micro-lenses are arranged in a first density, the second group of first micro-lenses are arranged in a second density, the third group of first micro-lenses are arranged in a third density, and the first density and the second density are greater than the third density.

An electronic device, comprising:

• a housing;
• an image sensor, received in the housing and comprising:
• a photosensitive cell array, comprising one or more focusing photosensitive cells and a plurality of non-focusing photosensitive cells;
• each of the focusing photosensitive cells and the non-focusing photosensitive cells comprising N*N photosensitive pixels;
• wherein N is a positive integer;
• a filtering cell array, disposed above the photosensitive cell array;
• and
• a micro-lens array, located above the filtering cell array, and comprising one or more first micro-lenses and a plurality of second micro-lenses;
• wherein each of the first micro-lenses is disposed correspondingly to and covering N*N photosensitive pixels in the corresponding focusing photosensitive cell;
• each of the second micro-lenses is disposed correspondingly to and covering one photosensitive pixel in the corresponding non-focusing photosensitive cell;
• a non-transitory memory, received in the housing and configured to store a executable program code;
• and
• a processor, received in the housing, configured to read the executable program code stored in the non-transitory memory, and run a program corresponding to the executable program code to:
• control the photosensitive cell array to enter a focusing mode;
• read output values of a part of the plurality of photosensitive pixels in each of the focusing photosensitive cells as first output values;
• read output values of the remaining part of the plurality of photosensitive pixels in each of the focusing photosensitive cells as second output values;
• perform focusing control according to the first output values and the second output values;
• control the photosensitive cell array to enter an imaging mode;
• control to expose the focusing photosensitive cells and the non-focusing photosensitive cells, and read output values of the photosensitive pixels of the focusing photosensitive cells and output values of the photosensitive pixels of the non-focusing photosensitive cells;
• and
• acquire a first pixel value of each of the focusing photosensitive cells by adding the output values of the N*N photosensitive pixels in the same focusing photosensitive cell, acquire a second pixel value of each of the non-focusing photosensitive cells by adding the output values of the N*N photosensitive pixels in the same non-focusing photosensitive cell, and generate a merged image by the first pixel value and the second pixel value.